Android:获取联系背景颜色的关键是什么？

Question

所以我一直在阅读如何创建自动生成的联系人背景颜色.显然它是基于联系人中键的hashCode().我已经看到它说电子邮件被用作密钥,但这没有任何意义,因为并非所有的联系人都有与之关联的电子邮件,而那些没有完全相同的颜色.

最终,我希望能够获得联系人卡片中使用的精确颜色.这样,我在我的应用程序中的图标具有与单击它时使用的相同的背景颜色,并使用ACTION_VIEW打开联系人卡片.

那么,只是想知道我需要使用什么作为关键来为每个联系人生成由android联系人应用程序生成的相同颜色？谢谢.

PS.这是我现在用于颜色味觉的十六进制代码.如果有人也可以说明这一点的准确性,我会非常感激.谢谢.

<array name="letter_tile_colors">
        <item>#f16364</item>
        <item>#f58559</item>
        <item>#f9a43e</item>
        <item>#e4c62e</item>
        <item>#67bf74</item>
        <item>#59a2be</item>
        <item>#2093cd</item>
        <item>#ad62a7</item>
    </array>

编辑:有些人一直在说它类似于另一个答案,Android棒棒糖接触颜色

答案的问题是它不完整.它解释了如何以相同的方式生成颜色,但我不只是尝试进行随机颜色生成.我希望获得默认联系人应用程序用于该联系人的确切颜色.

Answer 1

从Google ContactsCommon源代码：

所述标识符是一个独特的和确定的字符串，它可以被用来识别该接触。通常，这是联系人的查找键，但是也可以使用其他联系人详细信息，尤其是对于可能没有查找键的非本地或临时联系人。这用于确定图块的颜色。从ContactPhotoManager中。

该标识符用于LetterTileDrawable类以选择图块颜色（标识符来自联系请求）。

/**
 * Returns a deterministic color based on the provided contact identifier string.
 */
private int pickColor(final String identifier) {
    if (TextUtils.isEmpty(identifier) || mContactType == TYPE_VOICEMAIL) {
        return sDefaultColor;
    }
    // String.hashCode() implementation is not supposed to change across java versions, so
    // this should guarantee the same email address always maps to the same color.
    // The email should already have been normalized by the ContactRequest.
    final int color = Math.abs(identifier.hashCode()) % sColors.length();
    return sColors.getColor(color, sDefaultColor);
}

调色板在colors.xml文件中定义：

<!-- Background colors for LetterTileDrawables. This set of colors is a subset of
    https://spec.googleplex.com/quantumpalette#extended which passes Google Accessibility
    Requirements for the color in question on white with >= 3.0 contrast. We used
    http://leaverou.github.io/contrast-ratio/#white-on-%23db4437 to double-check the contrast.
    These colors are also used by MaterialColorMapUtils to generate primary activity colors.
-->
<array name="letter_tile_colors">
    <item>#DB4437</item>
    <item>#E91E63</item>
    <item>#9C27B0</item>
    <item>#673AB7</item>
    <item>#3F51B5</item>
    <item>#4285F4</item>
    <item>#039BE5</item>
    <item>#0097A7</item>
    <item>#009688</item>
    <item>#0F9D58</item>
    <item>#689F38</item>
    <item>#EF6C00</item>
    <item>#FF5722</item>
    <item>#757575</item>
</array>
<!-- Darker versions of letter_tile_colors, two shades darker. These colors are used
    for settings secondary activity colors. -->
<array name="letter_tile_colors_dark">
    <item>#C53929</item>
    <item>#C2185B</item>
    <item>#7B1FA2</item>
    <item>#512DA8</item>
    <item>#303F9F</item>
    <item>#3367D6</item>
    <item>#0277BD</item>
    <item>#006064</item>
    <item>#00796B</item>
    <item>#0B8043</item>
    <item>#33691E</item>
    <item>#E65100</item>
    <item>#E64A19</item>
    <item>#424242</item>
</array>
<!-- The default color used for tinting photos when no color can be extracted via Palette,
        this is Blue Grey 500 -->
<color name="quickcontact_default_photo_tint_color">#607D8B</color>
<!-- The default secondary color when no color can be extracted via Palette,
        this is Blue Grey 700 -->
<color name="quickcontact_default_photo_tint_color_dark">#455A64</color>
<color name="letter_tile_default_color">#cccccc</color>
<color name="letter_tile_font_color">#ffffff</color>

Answer 2

希望这可以帮助你

 private static final int NUM_OF_TILE_COLORS = 8;
 private final TypedArray mColors;

    //initialize inside oncreate of your activity
    mColors = res.obtainTypedArray(R.array.letter_tile_colors);//array of colors you have

    //call in wherver you want, key is the name of the contact
    private int pickColor(String key) {
    // String.hashCode() is not supposed to change across java versions, so
    // this should guarantee the same key always maps to the same color
    final int color = Math.abs(key.hashCode()) % NUM_OF_TILE_COLORS;
    try {
        return mColors.getColor(color, Color.BLACK);
    } finally {
        mColors.recycle();
    }
}